Metallicities and radial velocities of SMC clusters and field giants using the CaII triplet

Details Metallicities and radial velocities of SMC clusters and field giants using the CaII triplet Metallicities and radial velocities of SMC clusters and field giants using the CaII triplet

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35q.296p&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

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Scientific paper

We have obtained near-infrared spectra for approximately 300 red giants in 16 SMC clusters as well as roughly 180 field giants in the areas surrounding the clusters using the FORS2 instrument on the Very Large Telescope. The spectra cover a range of ˜ 1600 Å space in the region of the Ca II Triplet (CaT). We use these strong absorption lines to measure radial velocities and equivalent widths, from which we derive metallicities. We derive mean radial velocities and metallicities of each cluster to ˜ 3 km s^{-1} and 0.05 dex from an average of 6 member per cluster. We will use this information, together with that available for other clusters studied with the same technique, to analyze the SMC age-metallicity relation. Although most clusters of our sample already have photometric metallicity determinations, they have not been spectroscopically studied. Consequently, our work provides independent and more reliable information than the photometric studies and provides for the first time information about cluster radial velocity and membership. We are currentrly analyzing the field giants to compare the chemical evolution in clusters to that of the field and to perform a reliable analysis of the chemical evolution of the SMC.

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